First used in Drosophila, recombination frequencies can help map relative positions of genes along chromosomes. The greater the distance between two loci on a single chromosome, the greater the chance that they will be separated by a crossing-over event during meiosis I. If two genes are recombined in x% of gametes, they are separated by a genetic map distance of xmap units. In humans, such mapping located disease-causing mutations near single-nucleotide polymorphisms (SNPS). Recombination frequencies among six Drosophila chromosome genes (yellow-body (yb), white-eye (we), singed-bristle (sb), miniature wings (mw), round eyes (re), and hairy body (hb) are given in the table below. Using this information, place the genes in the correct relative order along the chromosome. Genes we and yb have been filled in to get you started. we yb sb mw re hb we 1.4 19.6 34.7 6.1 12.3 yb 1.4 21 36.1 7.5 13.7 sb 19.6 21 15.1 13.5 7.3 mw 34.7 36.1 15.1 28.6 22.4 re 6.1 7.5 13.5 28.6 6.2 hb 12.3 13.7 7.3 22.4 6.2 Note that the targets are not drawn to scale. |singed-bristle (sb) B) miniature wings (mw) round eyes (re) yb we | hairy body (hb)
First used in Drosophila, recombination frequencies can help map relative positions of genes along chromosomes. The greater the distance between two loci on a single chromosome, the greater the chance that they will be separated by a crossing-over event during meiosis I. If two genes are recombined in x% of gametes, they are separated by a genetic map distance of xmap units. In humans, such mapping located disease-causing mutations near single-nucleotide polymorphisms (SNPS). Recombination frequencies among six Drosophila chromosome genes (yellow-body (yb), white-eye (we), singed-bristle (sb), miniature wings (mw), round eyes (re), and hairy body (hb) are given in the table below. Using this information, place the genes in the correct relative order along the chromosome. Genes we and yb have been filled in to get you started. we yb sb mw re hb we 1.4 19.6 34.7 6.1 12.3 yb 1.4 21 36.1 7.5 13.7 sb 19.6 21 15.1 13.5 7.3 mw 34.7 36.1 15.1 28.6 22.4 re 6.1 7.5 13.5 28.6 6.2 hb 12.3 13.7 7.3 22.4 6.2 Note that the targets are not drawn to scale. |singed-bristle (sb) B) miniature wings (mw) round eyes (re) yb we | hairy body (hb)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:First used in Drosophila, recombination frequencies can help map relative positions of genes along chromosomes. The greater the
distance between two loci on a single chromosome, the greater the chance that they will be separated by a crossing-over event during
meiosis I. If two genes are recombined in x% of gametes, they are separated by a genetic map distance of xmap units. In humans, such
mapping located disease-causing mutations near single-nucleotide polymorphisms (SNPS). Recombination frequencies among six
Drosophila chromosome genes (yellow-body (yb), white-eye (we), singed-bristle (sb), miniature wings (mw), round eyes (re), and hairy
body (hb) are given in the table below. Using this information, place the genes in the correct relative order along the chromosome.
Genes we and yb have been filled in to get you started.
we
yb
sb
mw
re
hb
we
1.4
19.6
34.7
6.1
12.3
yb
1.4
21
36.1
7.5
13.7
sb
19.6
21
15.1
13.5
7.3
mw
34.7
36.1
15.1
28.6
22.4
re
6.1
7.5
13.5
28.6
6.2
hb
12.3
13.7
7.3
22.4
6.2
Note that the targets are not drawn to scale.
|singed-bristle
(sb)
B) miniature
wings (mw)
round eyes (re)
yb we
| hairy body (hb)
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